Charles e



(No Model.) I

' C. E. SCRIBNER.

ELEGTRIG ARC LAMP.

No. 486,958. Patented Nov. 29, 1892.

UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE YVESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 486,958, dated November 29, 1892.

Application filed January 2, 1883. Serial No. 80,753. (No model.)

T at whom it may concern.-

Be it known that 1, CHARLES E. SCRIBNER, acitizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Arc Lamps, (Case No. 51,),of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of IO this specification.

My invention relates to automatic cut-outs for electric-arc lamps; and its object is to provide for automatically opening a shunt-circuit around the lamp when the current is first established, this shunt being automatically closed again in case the lamp should be put out, whether accidentally or otherwise.

My cut-out is of special utility where several lamps are burned in one circuit. since by its use failure on the part of one lamp to feed will not interrupt the circuit.

My invention consists in the lifting-magnet included in the main circuit, a fine-wire magnet included in a shunt around the are, and a 2 5 shunt around both of these magnets, including resistance and contact points adapted to be controlled by either of said electro-magnets to open or close the said shunt-circuit, including the resistance.

My invention will be readily understood by reference to the accompanying drawing, in which I have shown an electric-arc regulator embodying my invention.

The main circuit may be traced from hook 3 5 q through the lifting-magnet r to the frame and carbon-rod, thence through the carbons, and thence to the other hook t. The shuntcircuit "a may be traced through the fine-wire coil '0, as shown. This fine-wire coil when magnetized serves to demagnetize its core, which is the armature of the lifting-magnet, thus causing the carbon to feed. Around this fine-wire coil and the are I connect the shuntwire to, in which I include resistance 10. The contact-points Q02 are so arranged in this shunt-circuit that they will be opened before the carbons are separated, and in case the lamp should fail to feed the armature will gradually sink to its lowest point, when the contacts 10 will be closed, thereby short-circuitin g the lamp. In the use of clutches there is a little lost motion-that is, the armature moves slightly before the clutch can grasp the rod. Suppose, for example, armature 7i) be at its lowest point, in which case the rod may be moved freely through the clutch. On raising the armature the clutch first grasps the rod and then as the armature moves farther up lifts the rod. There is thus a slight upward movement of the armature before the rod is lifted. I arrange the contacts 10 so that they will be separated by this slight movement or lost motion of the armature. The resistance win the resistance shunt-circuit to may be very slight, say one-half an ohm. Until the are is established the armature of the liftingmagnet t', which said armature forms also the core of the solenoid 1;, remains in its lowest position, and the clutch suspended thereon is opened, and hence the contacts 20 will "0 be closed, thus completing the resistance shunt-circuit around the lamp. Now when the current is established the resistance 10 is sufficient to cause sufficient current to flow through the lifting-magnet to raise the armaturo far enough to open the resistance shuntcircuit at w". As soon as this shunt-circuit is opened the wholecurrent is directed through the lifting-magnet, and the lifting-magnet is energized so as to attract its armature with sufficient force to cause the clutch to grasp the rod and separate the carbons. If now while the lamp is burning the carbon-rod should stick in the guides orbe arrested by a stop or otherwise so that the arc should increase to great length, or suppose the carbonpoint should break or fall out, then whatever might be the occasion of the trouble the armature will at once descend to its lowest position, thus closing the contacts 20 to complete the circuit around the carbons. This resistance shunt-circuit being closed will remain closed until the circuit through the arc isagain established. When this occurs the action of the lamp will be as in the first in- 5 I stance. The lifting-magnet will be sufficiently excited to attract its armature to open contact-points 20 The current will then be all directed through the lifting-magnet and the arc will be again established. As before stated, the solenoid c is in a shuntaround the are. Increase in length of arc thus increases the force of solenoid o. This solenoid '0 tends to suckits corethat is to say, the armature of liftingmagnet r-down, thus opposing the attractive force of the lifting-magnet 7".

The adjustment of the contact-points to with relationto the clutch which grasps the carbon-rod is such thatthey are not closed until after the clutch has entirely releasedthe rod. Thus the armature is permitted to freely feed the carbons together as they are burned away and to keep the are properly regulated in the ordinary working of the lamp Without closing the cutout or shunt around the arc.

It is evident that any other suitable form of resistance may be used instead of the coil 20'.

Having thus described my invention, I claim as new and desire to secure byLetters Patent- 1. In an electric-arc lamp, the combination, with an electro-magnet in the main circuit thereof, of an electro-magnet in the shunt-circuitof the arc of thelamp, a resistance shunting both the arc and the electro-inagnet in the main'circuit, and contact-points to open or close the said resistance shunt-circuit, the said contact-points being operated by either of the said electro-magnets 2. In an automatic cut-out for are lamps, a resistance-shunt with its contact-points, an electrounagnet in the main circuit, an electromagnet in the shunt of the arc of the lamp, the clutch for engagement with the rod, and said clutch being provided with lost motion to permit the breaking of the contacts to open the resistance-shunt before the carbon-points are separated.

3. The combination, in an electric-arc lamp, of the lifting-magnet placed in the main circuit and a fine-wire magnet included in a shunt around the are, a shunt around both of 

